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Chapter 5
Cell Membrane Structure
and Function
Active Lecture Questions
Copyright © 2011 Pearson Education Inc.
Which of the following is nonpolar?
1.
2.
3.
4.
Fatty acid tails
Water channels
Water
Phospholipid heads
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which of the following is nonpolar?
1.
2.
3.
4.
Fatty acid tails
Water channels
Water
Phospholipid heads
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
The term “fluid mosaic model” refers to:
1. An experiment that shows the function of
the cell membrane.
2. The dynamic flow of proteins and lipids
within the membrane.
3. The cell membrane’s ability to communicate
with the fluid portions of the cell.
4. The cell’s ability to communicate with the
fluid portions of the membrane.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
The term “fluid mosaic model” refers to:
1. An experiment that shows the function of
the cell membrane.
2. The dynamic flow of proteins and lipids
within the membrane.
3. The cell membrane’s ability to communicate
with the fluid portions of the cell.
4. The cell’s ability to communicate with the
fluid portions of the membrane.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
An organism living at the equator has more
saturated phospholipids in its cell membranes
than an organism living at the South Pole. Why?
1. In cold climates, more unsaturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
2. In cold climates, more saturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
3. In warm climates, more unsaturated fats with
kinked tails are needed to maintain the fluidity of
the cell membranes.
4. In warm climates, more saturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
An organism living at the equator has more
saturated phospholipids in its cell membranes
than an organism living at the South Pole. Why?
1. In cold climates, more unsaturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
2. In cold climates, more saturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
3. In warm climates, more unsaturated fats with
kinked tails are needed to maintain the fluidity of
the cell membranes.
4. In warm climates, more saturated fats with kinked
tails are needed to maintain the fluidity of the cell
membranes.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
The phospholipid tails of the membrane face one
another because:
1.
2.
3.
4.
They are hydrophilic—repelled by water.
They are hydrophobic—attracted to water.
They are hydrophilic—attracted to water.
They are hydrophobic—repelled by water.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
The phospholipid tails of the membrane face one
another because:
1.
2.
3.
4.
They are hydrophilic—repelled by water.
They are hydrophobic—attracted to water.
They are hydrophilic—attracted to water.
They are hydrophobic—repelled by water.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which of the following is NOT a function of cell
membrane proteins?
1. To move hydrophilic substances across the
plasma membrane
2. To communicate with other cells
3. To isolate the inside of the cell from the
outside
4. To identify cell type
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which of the following is NOT a function of cell
membrane proteins?
1. To move hydrophilic substances across the
plasma membrane
2. To communicate with other cells
3. To isolate the inside of the cell from the
outside
4. To identify cell type
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which is NOT a form of active transport?
1.
2.
3.
4.
Pinocytosis
Receptor-mediated transport
Phagocytosis
Osmosis
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which is NOT a form of active transport?
1.
2.
3.
4.
Pinocytosis
Receptor-mediated transport
Phagocytosis
Osmosis
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which cell has the highest surface area/volume
ratio?
1.
2.
3.
4.
A cell with a radius of 10 units
A cell with a radius of 20 units
A cell with a radius of 50 units
A cell with a radius of 100 units
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which cell has the highest surface area/volume
ratio?
1.
2.
3.
4.
A cell with a radius of 10 units
A cell with a radius of 20 units
A cell with a radius of 50 units
A cell with a radius of 100 units
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
A semipermeable membrane separates two
solutions, permitting water, but not larger
molecules, to pass. Side A contains a 20% sugar
solution. Side B contains a 40% sugar solution.
At equilibrium, what condition is true?
1.
2.
3.
4.
Side A will be hypertonic to side B.
Side A will be hypotonic to side B.
Side A will be isotonic to side B.
Side B will be hypotonic to side A.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
A semipermeable membrane separates two
solutions, permitting water, but not larger
molecules, to pass. Side A contains a 20% sugar
solution. Side B contains a 40% sugar solution.
At equilibrium, what condition is true?
1.
2.
3.
4.
Side A will be hypertonic to side B.
Side A will be hypotonic to side B.
Side A will be isotonic to side B.
Side B will be hypotonic to side A.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which membrane process requires molecules to
bind to a membrane protein?
1.
2.
3.
4.
Water movement through channels
Oxygen diffusion through the membrane
Receptor-mediated transport
Lipid movement across membranes
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which membrane process requires molecules to
bind to a membrane protein?
1.
2.
3.
4.
Water movement through channels
Oxygen diffusion through the membrane
Receptor-mediated transport
Lipid movement across membranes
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Facilitated diffusion uses what kind of protein?
1.
2.
3.
4.
Recognition
Enzyme
Attachment
Carrier
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Facilitated diffusion uses what kind of protein?
1.
2.
3.
4.
Recognition
Enzyme
Attachment
Carrier
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
The salt concentration of the fluid surrounding a
cell is more concentrated than the fluid inside the
cell. The cell will:
1.
2.
3.
4.
Shrink.
Swell.
Stay the same.
Transport salt into the cell.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
The salt concentration of the fluid surrounding a
cell is more concentrated than the fluid inside the
cell. The cell will:
1.
2.
3.
4.
Shrink.
Swell.
Stay the same.
Transport salt into the cell.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
What type of cell junctions are needed for a
tissue that must prevent fluids from leaking
across its cell layer?
1.
2.
3.
4.
Desmosomes
Tight junctions
Gap junctions
Plasmodesmata
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
What type of cell junctions are needed for a
tissue that must prevent fluids from leaking
across its cell layer?
1.
2.
3.
4.
Desmosomes
Tight junctions
Gap junctions
Plasmodesmata
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
In active transport, the energy source that moves
a molecule against its concentration gradient is:
1.
2.
3.
4.
Glucose.
NADPH.
NADH.
ATP.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
In active transport, the energy source that moves
a molecule against its concentration gradient is:
1.
2.
3.
4.
Glucose.
NADPH.
NADH.
ATP.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Animal cells communicate with one another
through:
1.
2.
3.
4.
Desmosomes.
Tight junctions.
Gap junctions.
Plasmodesmata.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Animal cells communicate with one another
through:
1.
2.
3.
4.
Desmosomes.
Tight junctions.
Gap junctions.
Plasmodesmata.
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which of the transport processes in the figure
below results in the movement of molecules from
a high to a low concentration?
1.
2.
3.
4.
Only a
Only c
a and c
a, b, c, and d
Figure 5-7
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
Which of the transport processes in the figure
below results in the movement of molecules from
a high to a low concentration?
1.
2.
3.
4.
Only a
Only c
a and c
a, b, c, and d
Figure 5-7
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
In the figure below, what is the correct
association?
1. Trunk lipids:
high fatty acid fluidity
2. Trunk lipids:
unsaturated fatty acids
3. Leg lipids:
low fatty acid fluidity
4. Leg lipids:
unsaturated fatty acids
Figure E5-1
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.
In the figure below, what is the correct
association?
1. Trunk lipids:
high fatty acid fluidity
2. Trunk lipids:
unsaturated fatty acids
3. Leg lipids:
low fatty acid fluidity
4. Leg lipids:
unsaturated fatty acids
Figure E5-1
Biology: Life on Earth, 9e
Copyright © 2011 Pearson Education Inc.